单项选择题
A.折射 B.反射 C.衍射 D.干涉
A.1 B.3 C.2 D.4
A.2s22p4 B.1s22s22p4 C.2s12p5 D.1s22s12p5
A.1s22p22p2 B.2s22p2 C.2p2 D.2p4
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